How long should a book be? Word counts by genre
Typical word-count ranges for every kind of book — adult novels by genre, YA, middle-grade, picture books, novellas, memoir and non-fiction — and why those ranges matter for readers, agents and print cost.
Most adult novels run between 70,000 and 100,000 words, with the sweet spot for a debut around 80,000–90,000. But it depends entirely on category: a cosy romance lands near 50,000, an epic fantasy can stretch past 120,000, a picture book stays under 1,000, and a business book sits around 40,000–60,000. The ranges below are guides, not rules.
Why does word count matter at all?
It is tempting to think length is your business and nobody else’s. Up to a point that’s true — but three real forces pull a finished book toward a sensible range, and ignoring all three usually shows.
The first is reader expectation. Readers buy by category, and each category carries an unspoken promise about heft. Someone reaching for a beach romance expects a single afternoon; someone buying epic fantasy expects to disappear for a fortnight. Land far outside the range and the book can feel slight, or like a slog, before a single sentence is read.
The second is agent and publisher norms. If you are querying traditionally, a debut novel that opens at 150,000 words signals an unedited manuscript and gets passed over, however good the prose. Agents read length as a proxy for discipline. This norm is real but not eternal — it shifts by genre and by year, so confirm current expectations against the submission guidelines of agents who actually represent your category rather than trusting any single chart, including this one.
The third is print cost, and it is the one self-publishers feel most directly. Word count drives page count, and page count drives the per-unit print price on Amazon KDP and IngramSpark. A 130,000-word novel is genuinely more expensive to print and post than a 90,000-word one, which squeezes either your margin or your cover price. If you are weighing where to launch, our guide to KDP vs IngramSpark walks through how those costs differ.
What are the typical word counts by genre?
Here are the ranges most editors, agents and writing bodies cite. Treat the middle of each range as the comfortable target and the edges as the points where you should have a reason. These are word counts, not page counts — a rough rule of thumb is around 250–300 words per printed page in a standard paperback, though that varies with trim size and type.
| Category | Typical word count | Notes |
|---|---|---|
| Literary fiction | 70,000–100,000 | Flexible; prized for control, not length. |
| Commercial / upmarket fiction | 80,000–100,000 | The broad mainstream-novel band. |
| Mystery / thriller / crime | 70,000–90,000 | Pace matters; tight is rewarded. |
| Romance | 50,000–90,000 | Category romance shorter; single-title longer. |
| Fantasy / science fiction | 90,000–120,000+ | Epic fantasy runs longest of all. |
| Historical fiction | 90,000–110,000 | Room for world and period detail. |
| Horror | 70,000–90,000 | Similar to thriller. |
| Young adult (YA) | 50,000–80,000 | YA fantasy reaches the upper end. |
| Middle-grade | 25,000–55,000 | Older / fantasy middle-grade runs longer. |
| Chapter book | 5,000–12,000 | Early readers, short chapters. |
| Early / picture book | 0–1,000 (often under 600) | Words carry less; pictures carry more. |
| Novella | 17,500–40,000 | Below this is a novelette / short story. |
| Memoir | 60,000–90,000 | Reads like a novel; one focused story. |
| Non-fiction / business | 40,000–70,000 | Tighter than fiction; argument over length. |
A note on children’s books
Children’s categories are the strictest of all, because they are tied to a child’s reading stage rather than taste. A picture book that runs to 1,500 words will struggle, however lovely, because it no longer fits the format or the read-aloud attention span it’s made for. Length here is craft, not preference — and the artwork does much of the storytelling, which is its own discipline. If you are making one, our notes on illustration cover how text and pictures share the load.
What if my book falls outside the range?
Being outside the band is a flag, not a verdict — but it’s worth reading honestly. A novel well under its range often hasn’t finished developing: thin subplots, scenes that end before they land, a world sketched rather than built. A novel well over its range usually has the opposite problem — repetition, scenes that restate what we already know, a subplot that could go. The cure for both is editorial, not arithmetic. A developmental read tells you whether you have a length problem or a structure problem wearing a length costume; that’s exactly what a good editor is for.
One genre genuinely rewards going long: epic and high fantasy, where readers treat a doorstop as a feature. Even there, the length has to be earned page by page — a long book that drags is still a book that drags.
How do I count, and does it really need to be exact?
Use your word processor’s built-in count and round to the nearest thousand; nobody expects 87,412. What matters is the band, not the decimal. Agents and editors think in round numbers, and so should you when you describe your book. Bear in mind that word count and final page count are different animals — typesetting, trim size and font all move the page total, which is why a press-ready interior is its own step after the writing is done. Our print preparation page explains how a manuscript becomes a properly laid-out book.
So how long should your book be?
As long as it takes to do its one job well, landing close enough to your category’s range that no reader, agent or printer trips over the number. Write the whole story first; worry about the count second. Trim what doesn’t earn its place and develop what’s thin — and the right length tends to arrive on its own.
When your manuscript is the right length and the words are right too, that’s the moment to make it a book. At Librum we’ve spent over fifteen years turning finished manuscripts into store-ready editions — edited by people, typeset to pass KDP and IngramSpark first time, with a fixed quote up front. Have a look at our packages when you’re ready.
Frequently asked questions
What happens if my novel is way over the typical word count?+
Running far above your category’s range carries two costs. If you’re querying agents, an oversized debut reads as undisciplined and often gets passed over. If you’re self-publishing, more words mean more pages, which raises the per-unit print price on KDP and IngramSpark — squeezing your margin or your cover price. Neither is fatal, but you should have a deliberate reason for the length.
How do I convert my word count into a page count?+
A rough rule of thumb is around 250–300 words per printed page in a standard paperback, so a 90,000-word novel lands near 300–360 pages. Treat this as an estimate only — the real figure shifts with trim size, typeface, type size and leading. The dependable number comes from your final typeset interior, which is what determines your actual print cost.
Does word count matter as much for self-publishing as for traditional publishing?+
The agent-and-publisher pressure largely disappears when you self-publish — no gatekeeper rejects you on length. But two forces remain. Reader expectation still applies: each category carries an unspoken promise about heft, and missing it can disappoint buyers. And print cost hits you directly, because word count drives page count, which drives the per-unit price on KDP and IngramSpark.
My manuscript is too long — how do I cut the word count?+
Cut at the scene level before the sentence level: remove scenes that don’t change something, then tighten the rest. Watch for repeated beats, throat-clearing openings and subplots that don’t pay off. A professional editor is the fastest route to a leaner manuscript — then go back and refine the trimmed draft so the pacing still holds together.